磷酸化田菁胶/聚磷酸铵对聚乳酸的协同阻燃作用。

Synergistic Flame Retardancy of Phosphatized Sesbania Gum/Ammonium Polyphosphate on Polylactic Acid.

机构信息

College of Chemistry, Tangshan Normal University, Tangshan 063000, China.

出版信息

Molecules. 2022 Jul 25;27(15):4748. doi: 10.3390/molecules27154748.

DOI:10.3390/molecules27154748

PMID:35897921

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9332061/

Abstract

Phosphating sesbania gum (DESG) was obtained by modifying sesbania gum (SG) with 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) and endic anhydride (EA). The structure of DESG was determined using Fourier transform infrared (FTIR) spectroscopy and nuclear magnetic resonance spectroscopy (H-NMR). Flame-retardant polylactic acid (PLA) composites were prepared by melt-blending PLA with DESG, which acted as a carbon source, and ammonium polyphosphate (APP), which acted as an acid source and a gas source. The flame retardancy of the PLA composite was investigated using vertical combustion (UL-94), the limiting oxygen index (LOI) and the cone calorimeter (CONE) test. Thermal properties and morphology were characterized via thermogravimetric analysis (TGA) and field emission scanning electron microscopy (FESEM), respectively. Experimental results indicated that when the mass ratio of DESG/APP was equal to 12/8 the LOI value was 32.2%; a vertical burning test (UL-94) V-0 rating was achieved. Meanwhile, the sample showed a lowest total heat release (THR) value of 52.7 MJ/m, which is a 32.5% reduction compared to that of neat PLA. Using FESEM, the uniform distribution of DESG and APP in the PLA matrix was observed. The synergistic effect of DESG and APP effectively enhanced the flame retardancy of PLA. Additionally, the synergistic mechanism of DESG and APP in PLA was proposed.

摘要

磷酸化田菁胶（DESG）是通过 9,10-二氢-9-氧杂-10-磷杂菲-10-氧化物（DOPO）和马来酸酐（EA）改性田菁胶（SG）得到的。DESG 的结构通过傅里叶变换红外（FTIR）光谱和核磁共振波谱（H-NMR）确定。通过熔融共混 PLA 与 DESG（作为碳源）和聚磷酸铵（APP）（作为酸源和气源）制备阻燃聚乳酸（PLA）复合材料。使用垂直燃烧（UL-94）、极限氧指数（LOI）和锥形量热计（CONE）测试研究 PLA 复合材料的阻燃性能。通过热重分析（TGA）和场发射扫描电子显微镜（FESEM）分别对热性能和形态进行了表征。实验结果表明，当 DESG/APP 的质量比等于 12/8 时，LOI 值为 32.2%；达到垂直燃烧测试（UL-94）V-0 等级。同时，该样品的总热释放（THR）值最低为 52.7 MJ/m，与纯 PLA 相比降低了 32.5%。通过 FESEM 观察到 DESG 和 APP 在 PLA 基体中的均匀分布。DESG 和 APP 的协同作用有效地提高了 PLA 的阻燃性能。此外，还提出了 DESG 和 APP 在 PLA 中的协同作用机制。